參數(shù)資料
型號(hào)： LTC2411-1CMS#TR
廠商： Linear Technology
文件頁(yè)數(shù)： 29/40頁(yè)
文件大小： 0K
描述： IC A/DCONV DIFF INPUT&REF 10MSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 24
采樣率（每秒）： 6.8
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 1mW
電壓電源： 單電源
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 10-MSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個(gè)差分，雙極
其它名稱： LTC2411-1CMSTR
LTC24111CMSTR
LTC2411/LTC2411-1
35
Figure 42. Bridge Amplification Using a Single Amplifier
APPLICATIO S I FOR ATIO
WU
UU
Note that this 4-amplifier topology has advantages over
the typical integrated 3-amplifier instrumentation ampli-
fier in that it does not have the high noise level common in
the output stage that usually dominates when an instru-
mentation amplifier is used at low gain. If this amplifier is
used at a gain of 10, the gain error is only 10ppm and input
referred noise is reduced to 0.15
VRMS. The buffer stages
can also be configured to provide gain of up to 50 with high
gain stability and linearity.
Figure 42 shows an example of a single amplifier used to
produce single-ended gain. This topology is best used in
applications where the gain setting resistor can be made
to match the temperature coefficient of the strain gauges.
If the bridge is composed of precision resistors, with only
one or two variable elements, the reference arm of the
bridge can be made to act in conjunction with the feedback
resistor to determine the gain. If the feedback resistor is
incorporated into the design of the load cell, using resis-
tors which match the temperature coefficient of the load-
cell elements, good results can be achieved without the
need for resistors with a high degree of absolute accuracy.
The common mode voltage in this case, is again a function
of the bridge output. Differential gain as used with a 350
bridge is:
A
RR
R
V ==
+
995
12
1 175
.
Common mode gain is half the differential gain. The
maximum differential signal that can be used is 1/4 VREF,
as opposed to 1/2 VREF in the 2-amplifier topology above.
Remote Half Bridge Interface
As opposed to full bridge applications, typical half bridge
applications must contend with nonlinearity in the bridge
output, as signal swing is often much greater. Applications
include RTD’s, thermistors and other resistive elements
that undergo significant changes over their span. For
single variable element bridges, the nonlinearity of the half
Figure 43. Remote Half Bridge Interface
0.1
F
5V
REF+
REF–
IN+
IN–
GND
VCC
2
3
2
4
6
7
3
350
BRIDGE
4
5
2411 F42
6
1
–
+
LTC1050S8
5V
0.1
V
R2
46.4k
20k
175
1
F
10
F
R1
4.99k
AV = 9.95 =
R1 + R2
R1 + 175
+
1
F
+
LTC2411/
LTC2411-1
2411 F43
REF–
IN+
IN–
GND
VCC
VS
2.7V TO 5.5V
2
3
4
5
PLATINUM
100
RTD
R1
25.5k
0.1%
6
1
4
3
2
1
REF+
LTC2411/
LTC2411-1
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